Requirements of digestible methionine + cystine for broiler chickens at 1 to 42 days of age

Revista Brasileira de Zootecnia

C.c. Goulart²  F.g.p. Costa¹  J.h.v. Silva¹  J.g. Souza¹  V.p. Rodrigues¹  C.f.s. Oliveira¹ 

[1] ,UFPB Programa de Doutorado Integrado em Zootecnia Sobral CE

关键词: digestible amino acids;    ideal protein;    sulfur amino acid;    aminoácidos digestíveis;    aminoácidos sulfurados;    proteína ideal;   

DOI  :  10.1590/S1516-35982011000400013

来源: SciELO

【 摘 要 】

The objective of this work was to estimate requirements of digestible methionine + cystine for broiler chickens from 1 to 42 days of age. It was carried out four experiments for each one of the following phases: pre-initial, initial, growing and final. The birds were distributed in a completely randomized experimental design, with six treatments and six replicates. Treatments consisted of a basal feed for each phase, deficient in digestible methionine + cystine and supplemented with DL-methionine to supply six levels of digestible methionine + cystine, resulting in different digestible methionine + cystine:digestible lysine ratios. In the pre-initial phase, levels of digestible methionine + cystine did not influence feed intake and feed conversion. However, weight gain responded in a quadratic way. In the initial phase, levels of digestible methionine + cystine had decreasing linear effect on feed intake whereas weight gain and feed conversion were influenced in a quadratic manner. In the growth and final phases, feed intake was not influenced by levels of digestible methionine + cystine, but weight gain and feed conversion presented quadratic response. The levels of 0.873; 0.755; 0.748 and 0.661% of digestible methionine + cystine in the diet or the daily intake of 183; 575; 1,104 and 1,212 mg of digestible methionine + cystine are recommended for the pre-initial, initial, growth and final phases, respectively, which corresponds to the ratios of 71; 70; 76 and 72% of digestible methionine + cystine to digestible lysine.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License